This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Wild Lettuce: Canker-weed: Lion's Foot. Prenanthes altissima.
Composite Family. July - Sept.
Plant 3 - 6 feet high, found in woodlands, thickets. Newfoundland to Manitoba, southward to Georgia and Tennessee.
Inner divisions inconspicuous, whitish, pendulous in loose terminal cluster, with small clusters from the leaf angles.
Long-stemmed, variously shaped, toothed, and cleft.

Rattlesnake-root.
 
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